Improvement in pipe-wrenches



W. CRUMBIE.

I PIPE-WRENCH.

No.171,999. Patented Jan. 11, 1876.

UNITED STATES PATENT, OFFICE.

WILLIAM ORUMBIE, OF ROUSEVILLE, PENNSYLVANIA.

IMPROVEMENTJN PIP E-WRENCHES Specification forming part of LettersPatent N0. 171,999, dated anuary 11, 1876; application filed June 17,1874.

. August 20, 1867, and numbered 67,937; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebein g had to the accompanying drawings and to the letters of referencemarked thereon.

My invention relates to an improvement in pipe tongs or wrench; andconsists in the combination of the operating-lever, locking device, andgrasping-jaws.

To enable others skilled in the art to make and use my invention, I Willproceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification,Ijigure 1 is a longitudinal section of my improved pipe-tongs. Fig. 2 isa side view of the same.

A represents the operating-lever, to which is pivoted, at z, the jawG,*"to which is hinged, at k, thejaw .B, in the inner end of which is arecess, h, into which is fitted the inner projecting end of the lever A.Thejaw B is furnished with a changeable tooth, D, which is held inposition through the medium of a set-screw, f. The tooth is constructedof steel, and can be so changed in its position on the jaw B that itseight edges .can be utilized for catching against the pipe 0, graspedbetween the jaws B and (J, as shown in the accompanyingdrawings. 'On theupper side of the operating-le' ver A is a locking-latch, e, which isheld in position on the lever through the medium of a set-screw, m,placed in a slot, n, of the latch e. The head of the set-screw projectsbeyond the side Walls of the slot a, and thereby holds the latch e inposition on the lever A. The jaw 0 may be furnished with a lever, asindicated by the dotted lines I in Fig. 1, for the purpose of obtaininga double leverage; but such additional lever will only be useful inlarge tongs.

The jaws B and C have the recesses therein formed so that when claspedaround a pipe said recesses will constitute a circular clasp entirelyaround the same. These jaws may be constructed of malleable cast-iron orcaststeel, and the lever of wrought-iron; but I do not confine myself tothe use of these articles.

' The operator places the jaws B and 0 over the pipe 0, with theprojection g of the lever A in the recess h of thejaw B. He then. movesthe locking-latch 0 forward, so that it enters the space p, as indicatedby the dotted lines a: in Fig. 2. This will prevent the projection g ofthe lever A from leaving the recess h of the jaw B. The operator thengives to the lever A the reciprocating motion common to the operating ofpipe-longs.

When it is desired to unship the tongs from the pipe the latch is drawnback into the position represented in the accompanying drawings.

Power of the grasp of the jaws, certainty and facility in the action ofthe tongs on the pipe, are the advantages of my improvement.

Having thus described my" improvement,

What I claim as of my invention is- The jaws B 0, provided withsemicircular recesses, whereby a pipe may be uniformly and entirelyclasped, and a tooth, D, for catching against said pipe, in combinationwith the le- .ver A, provided with a locking-catch, e, to

keep said lever and the jaw B in position together, all constructed andarranged substantially as and for the purposes set forth.

WM. ORUMBIE. Witnesses A. G. JOHNSTON, JAMES J. JOHNSTON.

